A 1.546 g sample of magnesium metal is heated in sufficient air at high temperature so that all of the magnesium reacts. The reaction forms 2.512 g MgO and a small quantity of another magnesium-containing compound that is 72.24% magnesium by mass and contains no oxygen. a) Determine the formula of the other magnesium-containing compound. b) Name this compound. c) Calculate the fraction of the original Mg present in this second compound.

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.